Memory-infra: Enable graph computation by default

Perfetto JSON exporter will only be able to write processed graphs in
legacy format. So, enable graph computation by default to verify other
consumers can handle this format.

Change-Id: Id39814653767acfff27d8c4dd939b69ba116f864
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2552820Reviewed-by: Eric Seckler <eseckler@chromium.org>
Commit-Queue: ssid <ssid@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830179}

services/resource_coordinator/memory_instrumentation/queued_request_dispatcher.cc

@@ -619,7 +619,7 @@ bool QueuedRequestDispatcher::AddChromeMemoryDumpToTrace(
     const base::TimeTicks& timestamp) {
   bool is_chrome_tracing_enabled =
       base::CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kEnableChromeTracingComputation);
+          switches::kDisableChromeTracingComputation);
   if (!is_chrome_tracing_enabled) {
     return tracing_observer->AddChromeDumpToTraceIfEnabled(
         args, pid, &raw_chrome_dump, timestamp);

services/resource_coordinator/memory_instrumentation/switches.cc

@@ -7,9 +7,9 @@
 namespace memory_instrumentation {
 namespace switches {
 
-// Enable the tracing service.
-const char kEnableChromeTracingComputation[] =
-    "enable-chrome-tracing-computation";
+// Disable the tracing service graph compuation while writing the trace.
+const char kDisableChromeTracingComputation[] =
+    "disable-chrome-tracing-computation";
 const char kUseMemoryTrackingProtoWriter[] = "use-memory-tracking-proto-writer";
 
 }  // namespace switches

services/resource_coordinator/memory_instrumentation/switches.h

@@ -10,7 +10,7 @@ namespace switches {
 
 // All switches in alphabetical order. The switches should be documented
 // alongside the definition of their values in the .cc file.
-extern const char kEnableChromeTracingComputation[];
+extern const char kDisableChromeTracingComputation[];
 extern const char kUseMemoryTrackingProtoWriter[];
 
 }  // namespace switches